Question

我有这个WMS图层：

http://apps.ecmwf.int/wms/?token=public&version=1.3.0&request=GetMap&layers=composition_bbaod550

我想将它添加到传单地图中，但它没有显示出来。这是我的代码：

library("leaflet")
library("sp")

leaflet() %>% addTiles() %>% setView(0, 50, zoom = 1) %>%
  addWMSTiles("http://apps.ecmwf.int/wms/?token=public&version=1.3.0&request=GetMap", 
  layers = "composition_bbaod550", 
  options = WMSTileOptions(format = "image/png", transparent = TRUE))

我做错了什么？

编辑＃1：

以下是来自开发者控制台的网络请求

编辑＃2：

这是我的代码与IvanSanchez的建议。正如您所看到的，建议的方法无法解决问题

library("leaflet")
library("sp")

leaflet() %>% addTiles() %>% setView(0, 50, zoom = 1) %>%
  addWMSTiles("http://apps.ecmwf.int/wms/", 
  layers = "composition_bbaod550", 
  options = WMSTileOptions(token = "public",
                           srs = "EPSG:4326",
                           format = "image/png", 
                           transparent = TRUE))

Answer 1

不在基本WMS网址中包含version和request参数。这些是由Leaflet内部添加的。 Leaflet需要 base WMS URL，如http://leafletjs.com/examples/wms/wms.html中所述。

所以而不是

  addWMSTiles("http://apps.ecmwf.int/wms/?token=public&version=1.3.0&request=GetMap",

待办事项

  addWMSTiles("http://apps.ecmwf.int/wms/?token=public&",

另外，引用Leaflet WMS tutorial：

L.TileLayer.WMS有额外选项，可在Leaflet’s API documentation中找到。任何未在此描述的选项都将在getImage URL中传递给WMS服务器。

所以你实际上可以做到

  addWMSTiles("http://apps.ecmwf.int/wms/", 
  layers = "composition_bbaod550", 
  options = WMSTileOptions(token = "public", format = "image/png", transparent = TRUE))

如果此操作失败，请在Web浏览器中使用开发人员控制台（按F12）并查看网络请求。如何向WMS发出请求？

编辑：

经过一小段调试后，似乎WMS服务器响应：

<!DOCTYPE ServiceExceptionReport SYSTEM "/static/frontend/contrib/exception_1_1_1.dtd">

<ServiceExceptionReport version="1.1.1">
<ServiceException code='InvalidSRS'><![CDATA[
Unsupported projection 'EPSG:3857'
]]>

</ServiceException>
</ServiceExceptionReport>

这意味着WMS服务器无法输出符合Leaflet默认地图投影的图像。

如果要使用此WMS服务器，则必须从其GetCapabilities文档中检查支持的地图投影列表，并使用Proj4Leaflet使地图使用与默认值不同的投影。

请阅读：

http://leafletjs.com/examples/wms/wms.html#notes-to-gis-users-of-wms-services（传单使用不同的地图项目）
http://www.qgistutorials.com/en/docs/working_with_wms.html（如何使用QGIS查看WMS的功能）
https://github.com/rstudio/leaflet/blob/master/inst/examples/proj4Leaflet.R（带有自定义地图项目的R的Leaflet示例）

对不起，没有直截了当的回答;你必须做一些工作并学习预测。

Answer 2

如果我们向WMS服务发出GetCapabilities请求，如下所示，我们可以看到支持的最高WMS版本是1.1.1。因此，您对版本= 1.3.0 WMS服务的GetMap请求可能会出错。

http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities&

当我查看响应时，它似乎有一些错误，实际上当我在我的XML编辑器中检查时，会出现很多错误（很多错误，以及日志在此答案中允许的字符数限制更大）。

WMS配置错误：

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Attribute "xlink:execution" is not allowed to appear in element "OnlineResource".
Start location: 44:17
End location: 44:54

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Unexpected element "SRS". The content of the parent element type must match "(Name?,Title,Abstract?,KeywordList?,SRS*,LatLonBoundingBox?,BoundingBox*,Dimension*,Extent*,Attribution?,AuthorityURL*,Identifier*,MetadataURL*,DataURL*,FeatureListURL*,Style*,ScaleHint?,Layer*)".
Start location: 97:8
End location: 97:11

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Unexpected element "SRS". The content of the parent element type must match "(Name?,Title,Abstract?,KeywordList?,SRS*,LatLonBoundingBox?,BoundingBox*,Dimension*,Extent*,Attribution?,AuthorityURL*,Identifier*,MetadataURL*,DataURL*,FeatureListURL*,Style*,ScaleHint?,Layer*)".
Start location: 122:10
End location: 122:13

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Attribute "multipleValues" is not allowed to appear in element "Extent".
Start location: 137:60
End location: 137:78

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Unexpected element "SRS". The content of the parent element type must match "(Name?,Title,Abstract?,KeywordList?,SRS*,LatLonBoundingBox?,BoundingBox*,Dimension*,Extent*,Attribution?,AuthorityURL*,Identifier*,MetadataURL*,DataURL*,FeatureListURL*,Style*,ScaleHint?,Layer*)".
Start location: 273:10
End location: 273:13

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Attribute "multipleValues" is not allowed to appear in element "Extent".
Start location: 288:60
End location: 288:78

System ID: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Main validation file: http://apps.ecmwf.int/wms/?token=public&service=WMS&request=GetCapabilities
Schema: http://schemas.opengis.net/wms/1.1.1/WMS_MS_Capabilities.dtd
Engine name: Xerces
Severity: error
Description: Unexpected element "SRS". The content of the parent element type must match "(Name?,Title,Abstract?,KeywordList?,SRS*,LatLonBoundingBox?,BoundingBox*,Dimension*,Extent*,Attribution?,AuthorityURL*,Identifier*,MetadataURL*,DataURL*,FeatureListURL*,Style*,ScaleHint?,Layer*)".
Start location: 393:10
End location: 393:13

...

SRS / LatLonBoundingBox / BoundingBox部分应如下所示（结构，而不是内容）：

<SRS>CRS:84</SRS>
<SRS>EPSG:27700</SRS>
<SRS>EPSG:3034</SRS>
<SRS>EPSG:3413</SRS>
<SRS>EPSG:3857</SRS>
<SRS>EPSG:4258</SRS>
<SRS>EPSG:4326</SRS>
<SRS>EPSG:900913</SRS>
<LatLonBoundingBox minx="-10.8018" miny="49.5889" maxx="3.92104" maxy="61.1359" />
<BoundingBox SRS="CRS:84"
            minx="-10.8018" miny="49.5889" maxx="3.92104" maxy="61.1359" />
<BoundingBox SRS="EPSG:27700"
            minx="-235677" miny="-34616" maxx="827937" maxy="1.28234e+006" />
<BoundingBox SRS="EPSG:3034"
            minx="2.5664e+006" miny="2.55843e+006" maxx="3.67848e+006" maxy="3.94271e+006" />
<BoundingBox SRS="EPSG:3413"
            minx="1.79406e+006" miny="-3.77262e+006" maxx="3.43831e+006" maxy="-2.09742e+006" />
<BoundingBox SRS="EPSG:3857"
            minx="-1.20245e+006" miny="6.37538e+006" maxx="436488" maxy="8.6571e+006" />
<BoundingBox SRS="EPSG:4258"
            minx="-10.8018" miny="49.5889" maxx="3.92104" maxy="61.1359" />
<BoundingBox SRS="EPSG:4326"
            minx="-10.8018" miny="49.5889" maxx="3.92104" maxy="61.1359" />
<BoundingBox SRS="EPSG:900913"
            minx="-10.8018" miny="49.5889" maxx="3.92104" maxy="61.1359" />

因此，服务肯定没有正确配置，这可能是您遇到任何问题的根本原因。

R：WMS地图没有显示出来

2 个答案: